M5Stack Core2 – EFIS-Style AHRS Indicator

This project turns an M5Stack Core2 into a cheap Primary Flight Display (PFD) / EFIS-style attitude indicator using only the built-in MPU6886 IMU(not verry accurate!!).

It shows:

• Artificial horizon (sky/ground) with pitch ladder
• Bank scale
• Slip/skid ball with simple physics model
• Flight Director crossbars (FD)
• Flight Path Vector / bird symbol (FPV)
• Compass heading tape with digital heading display
• pitch/roll values + battery voltage

---

Features

Flight Director (FD)

• Magenta crossbars in the center

Flight Path Vector (FPV / „Bird“)

• Green FPV symbol showing a rough estimated„flight path“ indication.
• Combines display pitch/roll with linear accelerations ax, ay:
• This is of course not a true FMS calibrated FPV (we have no airspeed / GPS)!

Heading Tape & Bottom Band

• Heading tape across the bottom:
  • Moving scale centered on current heading.
  • Central orange triangle pointer.
• Digital heading (000–359°)
• Right: numeric Roll and Pitch.
• Left: Battery voltage from AXP192.

---

Hardware & Software Requirements

Hardware

• M5Stack Core2 (with MPU6886 IMU and AXP192 PMIC)

Libraries used

• M5Core2
  (which internally uses TFT_eSPI / TFT_eSprite)
• Arduino core for ESP32 (standard M5Stack setup)

---

Building & Flashing

You can build either with the Arduino IDE or PlatformIO.

1. Arduino IDE

1. Install the ESP32 board support and the M5Core2 library via Library Manager.
2. Select board:
   • M5Stack-Core2 (or corresponding M5Stack Core2 entry)
3. Create a new sketch and paste the entire main.cpp code from this project.
4. Compile & upload.

2. PlatformIO

Example platformio.ini:

[env:m5stack-core2]
platform = espressif32
board = m5stack-core2
framework = arduino

lib_deps =
    m5stack/M5Core2

Have Fun!